It's about time I share some of the things I've been working on. 

Matlab
box3d - Draws a 3D box. 
linepoints - Calculates points along a line. 
rungekutta - Solves a differential equation with the Runge-Kutta method. 
xyz2mat - Converts a uniform set of xyz-values into a matrix/grid of z-values. 

PHP
datetimestamp - Creates a human-readable datetimestamp. 

Visual Basic Script
Picture Renamer - Renames pictures and videos with the dates they were created. 

WordPress
Comment to SMS - Plugin that notifies the blog owner of new comments via SMS. 
Intrasite Links - Plugin that finds links to the current post.